import java.util.List;

/**
 * @program: letcode
 * @author: lin
 * @create: 2020-03-07 13:49
 * @description: 两数相加
 */
public class AddTwoNumber {

    static class ListNode {
        int val;
        ListNode next;
        ListNode(int x) { val = x; }
    }


    public static ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummyHead = new ListNode(0);
        ListNode p = l1, q = l2, curr = dummyHead;
        int carry = 0;
        while (p != null || q != null) {
            int x = (p != null) ? p.val : 0;
            int y = (q != null) ? q.val : 0;
            int sum = carry + x + y;
            carry = sum / 10;
            curr.next = new ListNode(sum % 10);
            curr = curr.next;
            if (p != null) {
                p = p.next;
            }
            if (q != null){
                q = q.next;
            }
        }
        if (carry > 0) {
            curr.next = new ListNode(carry);
        }
        return dummyHead.next;

    }

    public static void main(String[] args) {

    }

}
